Debt-to-income ratio

A lender's measure of monthly debt payments as a percentage of gross monthly income. Lower is better. Most conventional loans cap it around 43% to 50%.

Also called DTI · Financing · Updated September 2026

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Part 1 of 4

Why a seller cares

DTI is the number most likely to sink a buyer's loan late in the process. A new car payment during underwriting can push a buyer over the cap, and that is a deal ending for a reason your house had nothing to do with.

Part 2 of 4

A simple example

A buyer earns $7,000 a month before tax. Their new mortgage payment would be $2,000 and their other debts $900, so their DTI is about 41%.

Debt-to-income ratio: a simple example
What happensThe buyer's DTI
Nothing changes41%; inside most lenders' limits
They finance a car with a $500 payment during underwritingAbout 49%; near or over the line
A co-borrower's income is addedLower; the loan is safer

A buyer's loan stays approved as long as their numbers do. Big purchases before closing are how the numbers move.

Part 3 of 4

What people get wrong

That preapproval settles it. DTI is checked again before closing, and it is the check that a new debt fails.

Part 4 of 4 · where to read next

Where it appears in the sale

What a definition is, and what it isn't

Keighbor is a software company, not a law firm, brokerage, or tax adviser. This is general information, not legal, tax, financial, or real estate advice about your sale. Your situation may differ. Before acting on a contract, disclosure, title, tax, or pricing question, ask an appropriately licensed professional in your state.

Written and researched by Keighbor Research · drawn from the reference glossary · how we research and check what we publish

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